The AKAI 1720 model reel to reel tape recorder described in this Manual is quite an old unit - circa late 1960's. As a consequence, the description of the mechanical details - and adjustments thereof - is quite critical. The manual does this quite well. The schematics are also well presented and have detailed PCB overlays. Probably the only negative is that some half-tone detail has been lost from the original manual as it has been scanned in simple B&W.

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Text excerpt from page 6 (click to view)

ADJUSTMENT AND CONTROLS + POSSIBLE COMPLAINTS
ADJUSTMENT AND CONTROLS Thermostat : Thermostat 25, fitted to the soleplate 26 has already been adjusted by the supplier and secured by glue. To avoid malfunction of the iron, NEVER readjust the thermostat. Adjustment thermostat 25, supplied as a spare part. N.B. Before starting to adjust the thermostat, make sure that a gap exists between the lower tip of the ceramic insulating pin and the real-off bracket. See fig. 1. Connect the connecting strips to an Ohm-meter. Set the thermostat stopper to the position as indicated in fig. 2. Turn the adjusting screw ( R ) clockwise or anti-clockwise until the Ohm-meter indicates â 0 â. ( The contacts are closed ) Then turn the adjusting screw clockwise until the Ohm-meter indicates â and the contacts have only just been opened. You hear a â click â. While loosely turning the thermostat stopper, check if the thermostat switches in the position as indicated in fig. 2. After the thermostat has been adjusted, adjust the real-off bracket. Set the thermostat stopper in the position shown in fig. 3. The thermostat contacts are closed. ( Ohm-meter indicates â 0 â ) Turn the set-screw S clockwise until the contacts have only just been opened. The Ohm-meter indicates â. Secure the adjusting screws with a glue. After adjusting the thermostat, always check the temperature of the soleplate, with the dial set to MAX. position ( 205 Â± 25 Â°C ) For location of testing point, see fig. 4. The temperature must be measured, after the iron has been connected to the mains for at least 15 min. The max. temperature shall not be higher than 230 Â°C.

POSSIBLE COMPLAINTS The pump (39) makes noise. This problem has been solved with effect from week 9806: 1) rubber stud (41) has been added; 2) a rim of plastic has been removed, see Fig.5. When the appliance was made before week 9806, this problem can be solved by removing the plastic rim as indicated in Fig.5 and adding rubber stud (41). The pump (39) doesnât pump water. This problem may occur when the cover of the stand (35) has buckled, which causes the cassette (31) to be lifted, see Fig. 6. When the cassette is pressed down, the pump functions properly again. With effect from week 9814, this problem has been solved by adding the extra screw I (Ã 2.5 x 10) and a stud in the stand (30). With appliances produced before week 9814, the stand (30) has to be replaced and a hole must be drilled in the cover (35), see Fig. 7. The release button (132) sticks. The length of the release button has been changed with effect from week 9814.